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by Admin » Thu Jun 21, 2018 12:12 pm

21. X. Pei, W. Kang, W. Yue, A. Bange, W. Heineman, and I. Papautsky. Disposable Copper-Based Electrochemical Sensor for Anodic Stripping Voltammetry // Anal. Chem. – 2014. Vol.86. P. 4893−4900.

Abstract: In this work, we report the first copper-based pointof care sensor for electrochemical measurements demonstrated by zinc determination in blood serum. Heavy metals require careful monitoring, yet current methods are too complex for a point-ofcare system. Electrochemistry offers a simple approach to metal detection on the microscale, but traditional carbon, gold (Au), or platinum (Pt) electrodes are difficult or expensive to microfabricate, preventing widespread use. Our sensor features a new low-cost electrode material, copper, which offers simple fabrication and compatibility with microfabrication and PCB processing, while maintaining competitive performance in electrochemical detection. Anodic stripping voltammetry of zinc using our new copper-based sensors exhibited a 140 nM (9.0 ppb) limit of detection (calculated) and sensitivity greater than 1 μA/μM in the acetate buffer. The sensor was also able to determine zinc in a bovine serum extract, and the results were verified with independent sensor measurements. These results demonstrate the advantageous qualities of this lab-on-a-chip electrochemical sensor for clinical applications, which include a small sample volume (μL scale), reduced cost, short response time, and high accuracy at low concentrations of analyte.

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by Admin » Mon Jun 25, 2018 8:45 am

22. Sun A., Wambach T., Venkatesh A. G. A Low-Cost Smartphone-Based Electrochemical Biosensor for Point-of-Care Diagnostics // IEEE Biomed Circuits Syst Conf. – 2014. 312–315. doi:10.1109/BioCAS.2014.6981725.

Abstract: This paper describes the development of a smartphone-based electrochemical biosensor module. The module contains a low power potentiostat that interfaces and harvests power from a smartphone through the phone’s audio jack. A prototype with two different potentiostat designs was constructed and used to conduct proof of concept cyclic voltammetry experiments with potassium ferro-/ferricyanide (K4[Fe(CN)6] / K3[Fe(CN)6]) in a side-by-side comparison with a laboratory grade instrument. Results show that the module functions within the available power budget and that the recovered voltammogram data matches well with the data from an expensive bench top tool. Excluding the loses from supply rectification and regulation, the module consumes either 5.7 mW or 4.3 mW peak power, depending on which of the two discussed potentiostat designs is used. At single quantity pricing, the hardware for the prototype device costs less than $30.

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by Admin » Sun Jul 08, 2018 7:41 am

23. Bezuidenhout P., Smith S., Land K. A Low-Cost Potentiostat for Point-of-Need Diagnostics. / Materials Science and Manufacturing, Council for Scientific and Industrial Research (CSIR), Pretoria, South Africa. 2017.

Abstract: The work presented details the development of a lowcost potentiostat, with the aim of creating an ink-jet printed hybrid paper-based low-cost sensing system for rapid water quality monitoring. Potentiostats exhibit high sensitivities and can be used for a variety of applications. In this application, they use electrochemical techniques to detect heavy metals via stripping analysis. The potentiostat front-end, consisting of an LMP91000 sensing chip, was designed and manufactured on a printed circuit board (PCB) and compared to a laboratory-based potentiostat using cyclic voltammetry performed using an 80 μl sample of 5 mM ferriferrocyanide dropped onto a commercial screen-printed electrode. The results obtained from the PCB potentiostat are comparable to those obtained using the development board and the laboratorybased potentiostat. The results highlight the functionality of a lowcost point-of-need potentiostat that can be used for environmental monitoring as well as the feasibility of transferring the design to a paper substrate.

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by Admin » Mon Jul 09, 2018 2:22 pm

24.Ma W.J., Luo C.H., Lin J.L., Chou S.H., Chen P.H., Syu M.J., Kuo S.H. and Lai S.C. A Portable Low-Power Acquisition System with a Urease Bioelectrochemical Sensor for Potentiometric Detection of Urea Concentrations // Sensors. – 2016. Vol. 16. 474; doi:10.3390/s16040474.

Abstract: This paper presents a portable low-power battery-driven bioelectrochemical signal acquisition system for urea detection. The proposed design has several advantages, including high performance, low cost, low-power consumption, and high portability. A LT1789-1 low-supply-voltage instrumentation amplifier (IA) was used to measure and amplify the open-circuit potential (OCP) between the working and reference electrodes. An MSP430 micro-controller was programmed to process and transduce the signals to the custom-developed software by ZigBee RF module in wireless mode and UART in able mode. The immobilized urease sensor was prepared by embedding urease into the polymer (aniline-co-o-phenylenediamine) polymeric matrix and then coating/depositing it onto a MEMS-fabricated Au working electrode. The linear correlation established between the urea concentration and the potentiometric change is in the urea concentrations range of 3.16  104 to 3.16  102 M with a sensitivity of 31.12 mV/log [M] and a precision of 0.995 (R2 = 0.995). This portable device not only detects urea concentrations, but can also operate continuously with a 3.7 V rechargeab-le lithium-ion battery (500 mA h) for at least four days. Accordingly, its use is feasible and even promising for home-care applications.

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25. Nejd L., Kynicky J., Brtnicky M., Vaculovicova M. and Adam V. Amalgam Electrode-Based Electrochemical Detector for On-Site Direct Determination of Cadmium(II) and Lead(II) from Soils // Sensors 2017, 17, 1835; doi:10.3390/s17081835.

Abstract: Toxic metal contamination of the environment is a global issue. In this paper, we present a low-cost and rapid production of amalgam electrodes used for determination of Cd(II) and Pb(II) in environmental samples (soils and wastewaters) by on-site analysis using difference pulse voltammetry. Changes in the electrochemical signals were recorded with a miniaturized potentiostat (width: 80 mm, depth: 54 mm, height: 23 mm) and a portable computer. Environmental samples were taken directly on-site and immediately analysed. Duration of a single analysis was approximately two minutes. The average concentrations of Cd(II) and Pb(II) in this area were below the global average. The obtained values were verified (correlated) by standard electrochemical methods based on hanging drop electrodes and were in good agreement. The advantages of this method are its cost and time effectivity (approximately two minutes per one sample) with direct analysis of turbid samples (soil leach) in a 2 M HNO3 environment. This type of sample cannot be analyzed using the classical analytical methods without pretreatment.

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by Admin » Mon Jul 16, 2018 11:50 am

26. Theanponkrang S., Suginta W., Weingart H., Winterhalter M., Schulte A. Robotic voltammetry with carbon nanotube-based sensors: a superb blend for convenient high-quality antimicrobial trace analysis // International Journal of Nanomedicine. – 2015. V.10. P. 859–868.

Abstract: A new automated pharmacoanalytical technique for convenient quantification of redox-active antibiotics has been established by combining the benefits of a carbon nanotube (CNT) sensor modification with electrocatalytic activity for analyte detection with the merits of a robotic electrochemical device that is capable of sequential nonmanual sample measurements in 24-well microtiter plates. Norfloxacin (NFX) and ciprofloxacin (CFX), two standard fluoroquinolone antibiotics, were used in automated calibration measurements by differential pulse voltammetry (DPV) and accomplished were linear ranges of 1–10 ìM and 2–100 ìM for NFX and CFX, respectively. The lowest detectable levels were estimated to be 0.3±0.1 ìM (n=7) for NFX and 1.6±0.1 ìM (n=7) for CFX. In standard solutions or tablet samples of known content, both analytes could be quantified with the robotic DPV microtiter plate assay, with recoveries within ±4% of 100%. And recoveries were as good when NFX was evaluated in human serum samples with added NFX. The use of simple instrumentation, convenience in execution, and high effectiveness in analyte quantitation suggest the merger between automated microtiter plate voltammetry and CNT-supported electrochemical drug detection as a novel methodology for antibiotic testing in pharmaceutical and clinical research and quality control laboratories.

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by Admin » Sun Jul 29, 2018 10:12 pm

27. Serra P. A., Rocchitta G., Bazzu G., Mancaa A., Puggioni G. M., Lowryb J. P. Design and construction of a low cost single-supply embedded telemetry system for amperometric biosensor applications // Sensors and Actuators.-2007. B 122. P. 118–126.

Abstract: A new embedded telemetry system for amperometric biosensor application is presented. The device consists of a single-supply miniature potentiostat-I/V converter, a microcontroller unit (MCU), a signal transmitter, and a stabilized power supply. The sensor current is converted to a digital value using a peripheral interface controller (PIC) MCU with an integrated analog-to-digital converter (ADC). The PIC firmware is developed in assembly and transferred to the MCU through an in-circuit-serial-programmer (ICSP). The digital data are sent to a personal computer using a miniaturized 433.92MHz amplitude modulation (AM) transmitter with a linear range up to 30 m. The radio receiver is connected to a PC via a Universal Serial Bus (USB). Custom developed software, written in C and Basic, allows the PC to record, plot and handle the received data. The design, construction and operation of the hardware and software are described. The system performance was evaluated in vitro using a dummy cell and a platinum (Pt) amperometric glucose biosensor. This device serves as a basic model to realize an in vivo, low-cost, miniaturized telemetry system built with standard hardware components readily available.

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28. Keiichiro Yamanaka, Mun’delanji C. Vestergaard,* and Eiichi Tamiya. Printable Electrochemical Biosensors: A Focus on Screen-Printed Electrodes and Their Application // Sensors. - 2016, 16, 1761; doi:10.3390/s16101761.

Abstract: In this review we present electrochemical biosensor developments, focusing on screen-printed electrodes (SPEs) and their applications. In particular, we discuss how SPEs enable simple integration, and the portability needed for on-field applications. First, we briefly discuss the general concept of biosensors and quickly move on to electrochemical biosensors. Drawing from research undertaken in this area, we cover the development of electrochemical DNA biosensors in great detail. Through specific examples, we describe the fabrication and surface modification of printed electrodes for sensitive and selective detection of targeted DNA sequences, as well as integration with reverse transcription-polymerase chain reaction (RT-PCR). For a more rounded approach, we also touch on electrochemical immunosensors and enzyme-based biosensors. Last, we present some electrochemical devices specifically developed for use with SPEs, including USB-powered compact mini potentiostat. The coupling demonstrates the practical use of printable electrode technologies for application at point-of-use. Although tremendous advances have indeed been made in this area, a few challenges remain. One of the main challenges is application of these technologies for on-field analysis, which involves complicated sample matrices.

Main Figures:


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by Admin » Tue Aug 14, 2018 9:46 am

28. Jordi Colomer-Farrarons, Pere L. Miribel-Catalа, A. Ivуn Rodrнguez-Villarreal and Josep Samitier. Portable Bio-Devices: Design of Electrochemical Instruments from Miniaturized to Implantable Devices / New Perspectives in Biosensors Technology and Applications. – 2011. P.379-399.

Abstract: The integration of biosensors and electronic technologies allows the development of biomedical systems able to diagnose and monitoring pathologies by detecting specific biomarkers. Experiences with amperometric sensors, calibration voltammetries and amperometric measurements, related to the presentation of the main techniques that can be used with such biosensors, are presented in this chapter, as well as the different results achieved in each case. A prototype to detect O2 in water for environmental purposes is presented as an example of a discrete disposable (Colomer et al., 2009c). The architecture and implementation of the electronics for an implantable approach is introduced (Colomer et al., 2009b), and comments concerning the implantable devices are included.

Main Figures:





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29. Bolaji Aremo, Mosobalaje Oyebamiji Adeoye, Imoh Bassey Obioh, Odunayo Adetola Adeboye. A Simplified Microcontroller Based Potentiostat for Low-Resource Applications // Open Journal of Metal. – 2015. V.5. P.37-46.

Abstract: A low component count, microcontroller-based potentiostat circuit was developed through the use of operational amplifiers arranged in different feedback configurations. This was developed to alleviate the cost burden of equipment procurement in low-cost and budget applications. Simplicity was achieved in the design by the use of the microcontroller’s native functionalities and a low-cost R/2R resistor ladder digital-to-analogue converter. The potentiostat was used to investigate the Ni2+/Ni(s) redox couple in a 3-electrode cell with a silver/silver chloride reference electrode and graphite counter and working electrodes. Linear sweep voltammograms were obtained at scan rates of 10, 20, 30 and 40 mV/s. The analysis of the peak current versus (scan rate)1/2 plot indicated that the Ni2+/Ni(s) reduction, though conforming to the Randles-Sevcik equation, was a nonreversible redox reaction.

Main Figures:


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